27398971 has 4 divisors (see below), whose sum is σ = 27784944. Its totient is φ = 27013000.

The previous prime is 27398953. The next prime is 27398999. The reversal of 27398971 is 17989372.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27398971 - 2⁷ = 27398843 is a prime.

It is a super-2 number, since 2×27398971² = 1501407223717682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27398071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192880 + ... + 193021.

It is an arithmetic number, because the mean of its divisors is an integer number (6946236).

Almost surely, 2^27398971 is an apocalyptic number.

27398971 is a deficient number, since it is larger than the sum of its proper divisors (385973).

27398971 is an equidigital number, since it uses as much as digits as its factorization.

27398971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385972.

The product of its digits is 190512, while the sum is 46.

The square root of 27398971 is about 5234.4026402255. The cubic root of 27398971 is about 301.4704511725.

The spelling of 27398971 in words is "twenty-seven million, three hundred ninety-eight thousand, nine hundred seventy-one".